Valve-timing gear for explosive-engines



A. BARNES. VALVE "MING GEAR FOR EXPLOSIVE ENGINES.

1,340,362. APPLICATION. FILED AUG-22, 19l9. May 18, 2 SHtE'ISSHEET la Hllllz Nil IKGIII'M r n I] k A o :."...'..k -wrnnm- I Momma A. BA VALVE TIMING GEAR F0 XPLOSIVE ENGINES. A P F L I C A T l 0 N F I L E D A UG.2Z, 19I9. 1,340,362. 6 Patented y 18,1920.

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Simona/I'm Juezyfimwes a jug "UNITED OFFICE.

AVERY BARNES, OF DANVILLE, ILLINOIS.

VALVE-TIMING GEAR FOR EXPLOSIVE-ENGINES.

Application filed August 22, 1919.

To all whom it may concern Be it known that I, AVERY BARNES, a citizen of the United States, residing at Danville, in the county of Vermilion and State of Illinois, have invented a new and Im proved Valve-Timing Gear for Explosive- Engines, of which the following is a specification.

This invention has reference to that type of mechanical movements in which tranimel gear devices are included in the connections that join a driving shaft and a driven shaft for transmitting multiplied motion to the said driven shaft, and my said invention primarily has for its object to provide an improved means of the general character stated, of a simple and economical construction, more especially designed for use in connection with internal. combustion engines and especially designed for imparting rotation to the cam operating shaft one-half as fast as the engine crank shaft, to thereby operate the valves in turn, as they should be on any engine using cams to operate the valve.

Another object of my invention is to provide, in a power transmission of the general character stated, a compact arrangement of the parts connecting the engine crank shaft and the cam shaft, in which the said parts are operatively so combined that they run practicall noiseless and by which irregularities o motion, as the crank passes over thedead centers, is substantially eliminated.

With other objects in view that will here inafter appear, my invention embodies, in a valve timing gear of the character described, the novel features of construction and peculiar arrangement of parts, stated in detail in the following description thereof, specifically pointed out in the appended claims and illustrated in the accompanying drawings, in which:

Figure 1 is a top plan view of my valve timing gear mechanism, so much of the engine crank or drive shaft, the cam shaft and the pump shaft being shown as is necessary to illustrate a practical application of my invention.

Fig. 2 is a front elevation thereof, looking in the direction of the arrow a.

ig. 3 is an end View of the same looking in the direction of the arrow 1).

Specification of Letters Patent.

Patented May 18, 1920.

Serial No. 319,253.

Fig. 4 is a face of the trammel disk.

Fig. 5 is a transverse section of the said disk.

Fig. 6 is a vertical section thereof on the line 6-6 on Fig. 4, the stationary support or framing and the wrist pin carrying eccentric and its trammel groove engaging guide being shown in their cooperative positions.

F i 7 is a detail section of the eccentric mem er.

Fig. 8 is a perspective view of one of the trainmel groove engaging guides.

In the practical arrangement of my invention, the gear mechanism includes a main or body portion 1, preferably of substantially disk shape and comprising two parts, one of which, preferably the upper in practice, is secured to the engine frame b cap screws 10 that are projected through the four outside apertures 11 in the said upper part of the body 1, as indicated in Fig. 1.

The lower part of the body portion 1 is secured to the upper part by the long bolts 55.

The body portion 1 has an opening 12, which opening is of different diameters, whereby an annular thrust collar 13 is provided within the opening, the purpose of which will presently appear.

3 desi nates what is hereinafter termed the era disk and it is of a diameter to snugly seat within that portion of the opening 12 of the larger diameter, as is clearly shown in Fig. 5, by reference to which it will be also noticed the said disk 3 may move in a rotary motion within the opening 2 but is held from end thrust by the collar 13.

2 designates what I term the trammel disk and it has a' finished face that moves against the rear face of the disk-like body 1 and the said trammel disk 2 is planed out to provide a series of trammel grooves 20 that extend across that face of the disk 2 which enga es the body 1, as shown.

he disk 3, which fits in the body 1, as above stated, has three apertures 30 spaced 120 degrees apart and which constitute bearings for the trammel groove engaging guides 1, the shape of which is best shown in detail in Fig. 7.

The trammel disk 2 has a collar 21 on the outer face thereof to receive the end of the cam shaft 7, to which in practice, it is se cured by a clamp screw 8 and a key (not shown).

The inner face of the disk 2 is finished for engaging the hody portion 1, hcl'ore stated, and it is litted with a wrist pin The pin 27 is fixedly attached to the crank disk or ram 3 and, when my invention used in connection. with a pump or fan shaft 9, as shown in Figs. 1. 2 and 3, the said pin 25 rotates in a circle in horizontal aalinement with the circular path of movement of the crank of the pump shaft 9. see dotted lines 0 on Fig. 2.

l5 designates a solid arm that extends tangentially from and is cast on the strap 16 that takes around the eccentric 17 on the engine crank 18, is best shown in Fig. 2.

The solid arm '15 has two liiearing's, one of which is a kick hearing" to receive the wrist pin of the eccentric or lrannncl disk 3 and one a split hearing to receive the crank oi ih pump shaft of thc engine.

The arrangement of the pa rts. as shown and dcs rihed. provides for the following action, when in operatioi'i:

As the engine crank is rotated, the eccen' tric 17 will transmit, through the strap 16, rotary motion to the Wrist pin 30 of the disk 3 and at the same time impart rotation to the crank of the pump shaft, it beingi understood that the several parts just re ferred to more at the same rate of speed.

The action of the trammel now takes place, which. through the connection dcscrihed and shown. will cause the cam shaft to move oneehall as fast as the engine crank shaft, thereby operating the valves in turn.

in the drawings l have shown the pump sl aft 9 as extended at both sides of thc crank. one side to operate the pump and th other to operate the fan pulley.

l 't is understood that the form of construction shown may be easily modified or changed to conform to any design of machine to which my invention is to he applied without departing from my said invention and as comes within the scope of the ap pended claims.

From the foregoing description taken in connection with the drawings, the complete construction, the manner of operation and the advantages of my invention will be readily understood by those skilled in the art to which my invention relates and therefore need not he further explained.

What I claim is:

l. The conihination with the crank shaft and the cam shaft of an engine: of a train incl gear connection hetween the said shafts for driving the cam shaft from the crank. shaft.

2. The conihination with the crank shaft and the cam shaft of an engine and a rd latahly moiinted crank disk; of an arm and eccentric connection that joins the crank sha ft and the crank disk, and a trammcl disk connection that joins with the said crank disk and the said cam shaft.

73. The combination with the crank shaft and the cam shaft of an engine and a rol'i'ital'il mounted crank disk; of an arm and eccentric connection that joins the crank shaft and the crank disk and a trammel disk onnection that joins with the said crank disk and the said cain shaft the said con uectiou comprisinga snp mrting member havingan opening within which the crank disk is mounted and a thrust collar enga-g inn the disk, another disk having radialiv extended and axially merging grooves at one side thereof and means for coupling with the cam shaft at the other side, and a guide carried by the crank disk adapted for slitlalily engaging the grooves in the disk held on the cam shaft.

4. The combination with the crank, the cam, and the pump shafts of an engine; of means for llllpt-tl'lllllg motion of like speed to the crank and pump shafts and a different speed of motion to the cam shaft, the said means comprising: an eccentric on the crank shaft. an arm projected from the band of the cccmitrhand connected at the outer end to the crank of the pump shaft. whereby to rotate the pump shaft at the same rate of SPF-Pd of the rank sha ft, a support, a crank disk rotatahly mounted within the supp another disk connected with the cam shaft and having trammel grooves in one face that travels over the coincidhnt face o'f the support. a. trammel groove engaging member carried by the crank disk, the letter having its wrist pin extended into the lever that connects the crank shaft eccentric and the pump shaft crank.

A VERY B AR'NES. 

